The 11th China (Liangshan) Special Purpose Vehicle Exhibition closed in Liangshan County, Shandong Province. Experts said at the special automobile industry development forum held during the exhibition that China's special-purpose vehicle market has broad development prospects.
It is understood that a special vehicle refers to a car with special equipment and special functions for carrying out special transportation tasks or special operations and other special purposes.
According to Liu Ming, director of the Automotive Industry Information Division of the Information Resource Development Department of the National Information Center, in the past 15 years, China's special-purpose vehicle market has developed rapidly, and the model structure has been diversified and segmented, and the total amount has grown rapidly. The value of modified vehicles associated with special vehicles increased from 35.27 billion yuan in 2000 to 196.51 billion yuan in 2013. According to the data of the special car branch of China Association of Automobile Manufacturers, as of the end of July this year, there were 1,037 special-purpose vehicle manufacturers in China and 806 enterprises in production.
Experts believe that the special-purpose vehicle industry experienced structural adjustment decline in the first half of the year, and the engineering-type special vehicles were most affected by this decline. Although the transportation vehicles have a certain decline, they have generally stabilized. In the rapid development of the domestic logistics industry, transportation The trend of vehicle-like vehicles is still in a period of benign growth.
Wang Huanmin, secretary-general of the China Automobile Industry Association Special Vehicle Branch, said at the forum that the high-speed development of the special vehicle industry after the “Golden Decade†is basically in a highly positive correlation with the GDP growth rate. Economic growth is the fundamental driving force for the growth of demand for special vehicles.
Experts generally believe that China is currently in the development stage of specialized division of labor from coarse to fine. According to the latest economic classification of the National Bureau of Statistics, China's economic industry category has reached 20 mega-categories, nearly 100 major categories, and more than 1,000 sub-categories. The increased specialization of economic development will promote the demand for special vehicles.
At the same time, an important feature accompanying future economic development will be the shortage of cheap labor and rising wages, which will speed up the replacement of special vehicles with labor and provide a broad space for the demand of special vehicles.
Wang Huanmin said that the enthusiasm of investment vehicles in various provinces and cities is still high, and the high growth rate attracts the rapid inflow of large amounts of capital. In the market reality that the market capacity is becoming saturated and the incremental space is gradually decreasing, the competition of enterprises will also change from “sports competition†to “eliminationâ€.
Aluminum gravity casting Introduction:
The gravity casting means the part is injected by the earth's gravity. The generalized gravity casting includes sand casting, Metal mold casting (permanent mould casting), investment casting, Lost Foam Casting, Mud casting etc. The narrow meaning of gravity casting is metal mold casting (permanent mould casting).
The permanent mold casting is modern technology that the mould made by heat resistant alloy steel.
The metal liquid generally injected into the gate by manual. Full of cavity depend on weight of liquid metal, exhaust, cool, open mould and get products.
Process flow: smelting, filling cavity, exhaust, cool, open mould, heat treatment, downstream processing.
The characteristics of the aluminum gravity casting:
1. Less casting porosity, heat treatment can be performed. The strength of the product can be improved greatly after heat treatment, better than Die Casting Parts.
2. Product density is low, molding depend on the liquid weight, the density of the product is lower than die casting parts, its strength is slightly worse, but the elongation is higher.
3. The product surface finish is not high. Easy form similar blasting pit on the surface of casting products after cooling contraction.
4. Slow filling and low production efficiency, the production efficiency is only about a quarter compare the high pressure casting, caused the product cost is high.
5. Mould life is longer than die casting mould, and mould cost is low also.
6. Process is relatively simple.
7. Not suitable for production of thin wall parts.
The aluminum gravity casting conventional materials
Production and QC control of aluminum gravity casting
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